Select 1 character (for example, "香"), then enter it in the location bar:
javascript:alert("香".charCodeAt(0).toString(16))
then click Enter.
You can also use this bookmarklet:
javascript:var%20s=window.getSelection().toString(),t=[];for(var l=0;l<s.length;++l)t.push(s.charAt(l)+"="+s.charCodeAt(l).toString(16));alert(t.join("\n"))
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